2013 年 25 巻 4 号 p. 425-429
[Purpose] The purpose of this study was to test the reliability and validity of a breathing movement measuring device (BMMD) that was newly developed for the objective assessment of breathing movements in clinical practice. [Subjects and Methods] The breathing movement distances of the chest (bilateral third and eighth ribs) and abdomen (upper abdomen) of 30 healthy young males were measured using the BMMD and a three-dimensional (3D) motion analysis system during quiet breathing. During measurements, the pen-size mechanical BMMD was held in the hand and placed on selected observation points. Distances on the BMMD scale were read by two raters. In addition, the breathing movement distances of 10 subjects were measured during quiet breathing using the BMMD fixed on a tripod. The distances between the reflective markers on the observation points were measured. The intraclass correlation coefficient, Bland-Altman analysis, and Pearson’s correlation coefficient were performed. [Results] The inter-rater reliability of the BMMD was low-to-moderate. However, the reliability and validity between the two measurement methods were high. Systematic errors were identified for almost all the observation points. [Conclusion] The reliability and validity of the BMMD, which works by comparing the reflective marker distances, were acceptable. These findings suggest that the BMMD may be useful for quantitatively assessing chest and abdominal wall movements during quiet breathing in clinical practice.